Looper mechanism for sewing-machines.



G. HOEPNER. LOOPER MECHANISM FOR SEWINGMACHINES.

APPLICATION FILED AUG.I5. I917.

Patented July 2,1918.

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G. HOEPNER.

LOOPER MECHANISM FOR SEWING MACHINES.

APPLICATlON FILED AUG.I5, 1917.

1 ,,%?W@%@ v Patented July 2, 1918..

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GEORGE HOElPNlE-R, OF CHICAGO, ILLINOIS.

Specification of Letters Patent.

Patented ilfnly 2, 111%..

Original application filed October 27, 1916, Serial no. 128,104.. Divided and this application filed August it, 1917. Serial No. 186,257.

To all whom it may concern:

Be it known that I, GEORGE HOEPNER, a citizen of the United States, residing at Chicago, county of Cook, State of Illinois, have invented a certain new and useful Improvement in Looper Mechanism for Sew ing-Machines, and declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accom panying drawings, which form a part of this specification.

My invention has for its object to produce a simple, powerful and efiicient sewing ma chine adapted for a great variety of uses and particularly for heavy work.

A further object of the present invention is to produce a simple and novel looper.

The various features of novelty whereby my invention is characterized will hereinafter be pointed out with particularity in the claims; but, for a full understanding of my invention and of its objects and advantages, reference may be had to the following detailed description taken in connection with the accompanying drawings, wherein:

Figure 1 is a side elevation of a sewing machine head, with the side or cover removed, containing a preferred embodiment of my invention; i

Fig. 2 is a side elevation of the looper rod and looper, together with the swiveled bearing therefor;

Fig. 3 is a section taken approximately on line 3-3 of Fig. 2;

Fig. 4 is a sideview of the looper element detached from the supporting devices;

Fig. 5 is a diagrammatic view illustrating a row of stitches made by the machine and one step in the process ofmaking one of the stitches, y

Fig. 6 is a diagrammatic view illustrating a second step in'thc process of making a stitch; and

Fig.7 is a diagrammatic view illustrating a third step in the process of making a stitch.

Referring to the drawings, 1 represents a. frame in the form of an inverted U across the yoke portion of which extends a horizontal driving shaft, 2. In the lower end of one of the arms of the frame is a horizontal reeiprccable needle bar, 3, and the usual preeser foot barge, between siiieh a suitable work-engaging plate, 5, on the opposite arm of the frame, the work is held. In the frame above the needle bar is a bell crank lever, 6, between the lower long arm of which and the needle bar is a connecting link, 7. Between the upper short arm of the bell crank lever and the driving shaft, 2, is a connecting rod, 8, attached eccentrically to the end of the driving shaft by a universal joint, 9, and to the bell crank lever by means of a clevis, 10, which a'fiords move ment about two axes at right angles to each other.

Mounted on the other arm of the frame is a work-feeding arm, 11, having a Work-feeding element, 11*, pivotally supported between its ends so as to be rotatable about .a pin, 12, parallel with the shaft 2 and about a second pin, 18, at right angles to the shaft. 2. An eccentric, 14, arranged on the shaft and engaging with the upper end of the arm 11 serves to oscillate itabout the pin 12. A cam device, 15, acting on a cam roll, 16, carried by the upper end of the arm 11, combined with a spring, 17 serves to oscillate the work-feeding arm about the pin 13.

At one side of the work-feeding arm is a vertical oscillatory reciprocable rod, 18, the

upper end of which is connected to a crank,

19, formed in the driving shaft. Near'its lower end the rod passes slidably through a block, 20, pivotally connected at one side thereof to the frame by means of a bolt or screw, 21, passing through an opening, 22, in the block. It will be seen that as the driving shaft is revolved it reciprocates the rod 18 and at the same time oscillates it through a small angle; this oscillatory.motion'being permitted bythe pivotal mounting of the block 20. The rod 18 is a looper rod and on its lower end carries a looper device adapted to cooperate with the needle 23. The looper comprises a short tubular body portion, 25, having a downwardly extending flattened part, 26, provided in one face with a groove, 27, forming a continuation of the bore or passage in the tubular member and having in the point thereof an eye, 28. The looper is held in a suitable head, 29, in such amanner as to permit it to stand approximately vertically and have capacity for adjustment in the vertical direction; the head being: in

turn supported on the lower end of the rod 18 in such a manner as to permit it to be burned angularly about the axis of the rod.

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to '1 as and, if desired, be adjusted in the direction of the length of the rod. It will be seen that as the driving shatt revolves it causes the looper to rise and fall while at the same 5 time it moves through .a limited distance transversely to a vertical plane; this latter ,mpyement neiedflng to be only greatenough to permit the looperto travel across the top "of the' iieedle s'oasto enable it'to come up on one side of the needle, when the latter is in the work, and go down on the other side he of, 7 7 I v.

The needle is threaded in the usual way anda thread, ,not shown, is also adapted'to pass" suitable source of' supply ithiiough eye in a stationary part, 30, arjrange'dfin proxi ity to the'looper and thence down-through the tubular member, 25, and

'g'hftlife eyejZS, of the looper. viewingthe parts as they'appear in Fig. (1', th 'e d ebein e a t d; h l e i as a andfi's" traveling forwardtoward the observer, holding its thread, A, (see Fig. 5) through a loop, I), that the looper has just 25 ta'k the needle and carrying this fo Ward'towardthe ohserver and lay- I ai n st then' ork, CL Th ework is now lhe'i g ed' away from anoloserver in Fig. 1

so that the" loop, 7),- is being acted upon both by e pullin'gfforce on the work and by the looper] When the looper reaches a position in front; of the needle, the needle starts back toward the work," fnrming its thread, B, into a sec dnd loo 'a, "Zgb,which is carried toward to t'heworkas indicated in Fig; 6. The 166 3 5Z2 passes underneath the loop 6 because the latter isbeing lifted by the looper"at,"tlie" Sam time that it being lengthenedor extended; this being dueto the-rm" that, the *looper -is traveling uplWar h 'le-the needle is advancing into W, k Qandjvvhil e thelooper is still movjag: a fl direct'ion to lengtl' en the 1 01). Fig, (shows the condition r the parts ijustaafter 'the needle-hasstarted' on its -batk-" nbkejsc as to cause the loop to iipenl; theloop'erbeing'justl about to descend .b'etvventh needle-and its thread, namely througli' tl'fe'loop Z16 which is then laid down the workjs' fed ahead untilit takesposition' of th'elcop'tin'Fig. 5. ffWhile 1 have illnstiitatedand described more oi less in'detaih a particular form of connection between the driving shaft'anjd the ban and, a paliticular type of workd fc ev ice, such. illustrated in my 01- a pn an0 sena1. No. 128,104, dated 0 0 27, 1?9 16',of whichthe present applisia division, the present invention t do :only vvith' 'niy novel loop-forming eds-tending transversely of Q a thread,

.nection between the driving shaft and operating respectively the needle bar, the work focding element, and the looper.

I claim:

'1. In a sewing machine, a driving shaft having a crank therein, a reciprocablc needle arranged parallel with said shaft, :1 looper rod connected at one endto said crank, a, looper at theothcr cnd of said rod arranged in proximity to the path of said needle, and means for supporting said rod at a point between its ends in a manner to cause the looper to describe a path lying in a plane at right angles to the path of travel of thencedle and passing entirely around the path of travel of the needle.

2. In a sewing machine, a driving shaft having a crank therem, a reciprocablc needle arranged parallel with said shaft, a looper rod connected at one end to said crank, a

looper carried on the other end of said rod proximity to the path of travel of the needle, and means for slidably and pivotally supporting said rod between the ends theretrod connected at one end to said crank, a, v looper carried on the other end of said rod.

and having in the point thereof an eye for andmeans for supporting said rod at a point between its ends to permit the looper to carry its thread completely around the path of travel of the needle in such time relation to the needle as to cause the needle thread and the looper thread to be interlocked in a stitch.

. a. In a sewing machine, a reciprocable needle bar, a rotary main drive shaft parallel with and at some distance from the bar,

a connecting rod and lever mechanism be- .tweenthe the same, an arm extending. from the shaft to a point adjacent to the line of travel of shaft and the bar for actuating the needle bar, a work-feeding element on the arm at the latter point, a driving conthe shaft and the arm, a looper rod extending from the shaft toward the line of travel of the needle bar, a looper on said rod adapted to be moved across the line of travel of the needle bar, and a'dl-ivlng connection between the rod and the .,v V, shaft. a r lfi 'considered, by itself and as a 5,. In a sewing machine, a main driving shaft a rcciprocable needle bar parallel with the shaft, and an oscillatory and rcclprocatory looper an oscillatory feeder arln rod extending transversely of said shaft;

a connecting rod and lever mechanism between said shaft and the needle bar for driving the latter; and driving connections between the shaft and the feeder arm, and the shaft and the looper rod.

6. In a sewing machine, a main driving shaft, a reciprocable needle bar parallel with the shaft, an oscillatory feeder arm extending transversely of the shaft, a driving connection between the shaft and said bar including a connecting rod and lever mechanism and a driving connection between the shaft and said arm.

7. In a sewing machine, a main driving shaft, a reciprocable needle bar parallel with the shaft, an oscillatory and reciprocatory looper rod extending from said shaft toward the line of travel of the needle bar, a looper on said rod adapted to be moved across the line of travel of the needle bar, a driving connection between the shaft and the needle bar including a connecting rod and lever mechanism, and a driving connection between the shaft and the looper rod.

8. In combination, a looper rod, a head secured to one end of said rod and projecting laterally therefrom, said head being adjustable in the direction of the length of the rod and also angularly of the axis of the rod, and a looper mounted in said head at some distance from the rod and lying approximately parallel with the rod, said looper being adjustable in the direction of its length and also angularly about its axis.

In testimony whereof, I sign this specification.

GEORGE HOEPNER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

ashinmton, n. U. 

